Hi,
Create a Python model that extends the product.template model to add your custom boolean field. You can do this by creating a Python file in your custom module's directory, for example, models/product.py, and define your model like this:

from odoo import models, fields

class ProductTemplate(models.Model):
    _inherit = 'product.template'

    custom_boolean_field = fields.Boolean(string='Custom Boolean Field')

Create a View:

• Next, you should define a view to display the custom field on the product page. Create an XML file in your custom module's views directory, for example, views/product_template_view.xml, and add the following code:

<?xml version="1.0"?>
<openerp>
    <data>
<record id="view_product_template_form_inherited" model="ir.ui.view">
<field name="name">product.template.form.inherited</field>
<field name="model">product.template</field>
<field name="inherit_id" ref="product.product_template_form_view" />
            <field name="arch" type="xml">
                <field name="list_price" position="after">
                    <field name="custom_boolean_field"/>
                </field>
            </field>
        </record>
    </data>
</openerp>

Update the Manifest File:

Update the __manifest__.py file in your custom module's directory to specify the module's dependencies and other information.

Hope it helps

If you use enterprise version , use Odoo Studio to create (or) change fields, forms.

You can learn about studio here.

link - https://www.cybrosys.com/blog/odoo-studio-an-overview

Thanks.